Drive device

Abstract

In a drive device, a first flow path of a fluid connects a gear accommodation portion and an inlet of a pump. A second flow path connects an outlet of the pump and one end of a third flow path via a cooler. The third flow path is inside a partition wall of a housing and intersects a rotation axis of a first shaft. A fourth flow path connects another end of the third flow path and one end of a fifth flow path. The fifth flow path is inside a gear side lid of the housing. Another end of the fifth flow path is connected to one end of a second shaft in an axial direction. One end of a sixth flow path is connected to another end of the third flow path. Another end of the sixth flow path is inside a housing tubular portion.

What is claimed is: 
     
       1. A drive device comprising:
 a motor portion that has a rotor having a first shaft rotatable about a rotation axis extending in an axial direction, and a stator disposed radially outward of the rotor; 
 a gear portion that is attached to one axial direction side of the first shaft; 
 a housing that accommodates the motor portion and the gear portion; 
 a pump that delivers a fluid within the housing; 
 a cooler that cools the fluid; and 
 a fluid flow path through which the fluid flows, 
 wherein the first shaft has a tubular shape extending in the axial direction, and has a shaft through-hole penetrating in a radial direction, 
 the gear portion has a second shaft that has a tubular shape extending in the axial direction and is connected to one end portion of the first shaft in the axial direction, 
 the housing includes
 a housing tubular portion that extends in the axial direction and accommodates the motor portion, 
 a partition wall that closes one end portion of the housing tubular portion in the axial direction, and 
 a gear side lid portion that is disposed at one end portion of the partition wall in the axial direction and constitutes a gear accommodation portion that accommodates the gear portion in cooperation with the partition wall, 
 
 the fluid flow path has a first flow path, a second flow path, a third flow path, a fourth flow path, a fifth flow path, and a sixth flow path, 
 the first flow path connects the gear accommodation portion and a first inlet of the pump, 
 the second flow path connects a first outlet of the pump and one end portion of the third flow path via the cooler, 
 the third flow path is disposed inside the partition wall and extends in a direction intersecting with the rotation axis, 
 the fourth flow path connects an other end portion of the third flow path and one end portion of the fifth flow path, 
 the fifth flow path is disposed inside the gear side lid portion, 
 an other end portion of the fifth flow path is connected to one end portion of the second shaft in the axial direction, 
 one end portion of the sixth flow path is connected to the other end portion of the third flow path, and 
 an other end portion of the sixth flow path is disposed within the housing tubular portion. 
 
     
     
       2. The drive device according to  claim 1 , wherein the pump and the cooler are disposed on a radially outer surface of the housing tubular portion, and are aligned in a circumferential direction. 
     
     
       3. The drive device according to  claim 1 , wherein
 the first inlet is disposed on one axial direction side of the pump, 
 the first outlet is disposed on an other axial direction side of the pump, 
 a second inlet of the cooler is disposed on an other axial direction side of the cooler, and is connected to the first outlet, and 
 a second outlet of the cooler is disposed on one axial direction side of the cooler, and is connected to the third flow path. 
 
     
     
       4. The drive device according to  claim 3 , wherein
 the cooler is disposed in one circumferential direction from the pump, 
 the second inlet is disposed on the other axial direction side and an other circumferential direction side of the cooler, and 
 the second outlet is disposed on the one axial direction side and one circumferential direction side of the cooler. 
 
     
     
       5. The drive device according to  claim 1 , wherein
 the housing further has a bearing holding portion that rotatably holds the first shaft via a bearing, and 
 the sixth flow path has a fluid supply member that is disposed radially outward of the stator to supply the fluid to the stator, and 
 the fluid supply member has at least one supply hole that is opened to at least one of the stator and the bearing. 
 
     
     
       6. The drive device according to  claim 5 , wherein
 a minimum flow path cross-sectional area in the fourth flow path is narrower than a minimum flow path cross-sectional area in the sixth flow path, and 
 a minimum flow path cross-sectional area in the third flow path is wider than the minimum flow path cross-sectional area in the sixth flow path. 
 
     
     
       7. The drive device according to  claim 1 , wherein
 the fourth flow path has a third inlet and a tank, 
 the tank is connected to the other end portion of the third flow path through the third inlet, and 
 a flow path cross-sectional area of the tank is wider than a flow path cross-sectional area of the third inlet. 
 
     
     
       8. The drive device according to  claim 7 , wherein
 the tank has
 a first tank member having a tubular shape and extending from one axial direction side of the partition wall in one axial direction, and 
 a second tank member that has a tubular shape extending from an other axial direction side of the gear side lid portion in an other axial direction and is connected to one end portion of the first tank member in the axial direction. 
 
 
     
     
       9. The drive device according to  claim 8 , wherein one of the one end portion of the first tank member in the axial direction and an other end portion of the second tank member in the axial direction is fitted to the other. 
     
     
       10. The drive device according to  claim 8 , wherein the one end portion of the first tank member in the axial direction is in contact with an other end portion of the second tank member in the axial direction via a sealing member. 
     
     
       11. The drive device according to  claim 7 , wherein
 a first direction is a direction perpendicular to the axial direction and a vertical direction, and 
 the tank has
 a third outlet that is disposed vertically downward of the tank and on one side of the first direction when viewed from the axial direction and is connected to the fifth flow path, and 
 a bottom surface extending vertically downward as the bottom surface is directed to the one side of the first direction. 
 
 
     
     
       12. The drive device according to  claim 11 , wherein the third outlet is disposed at one end portion of the tank in the axial direction. 
     
     
       13. The drive device according to  claim 11 , wherein
 the third outlet is disposed away from one end portion of the tank in the axial direction to in the other axial direction. 
 
     
     
       14. The drive device according to  claim 11 , wherein
 the tank further has an inclined surface disposed to face the third inlet, and 
 the inclined surface extends in one axial direction as the inclined surface is directed vertically downward. 
 
     
     
       15. The drive device according to  claim 14 , wherein
 an inner surface of one end portion of the fifth flow path is connected to the inclined surface, and 
 a direction in which the one end portion of the fifth flow path is parallel to the inclined surface. 
 
     
     
       16. The drive device according to  claim 1 , wherein
 the fluid flow path further includes a seventh flow path, 
 one end portion of the seventh flow path is connected to an other end portion of the sixth flow path in the axial direction, and 
 an other end portion of the seventh flow path is connected to an other end portion of the first shaft in the axial direction.